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In `linux` OS:

C_INCLUDE_PATH=/usr/local/include/ImageMagick-6/ gem install rmagick

Building native extensions. This could take a while...

ERROR: Error installing rmagick:
ERROR: Failed to build gem native extension.

/home/vagrant/.rvm/rubies/ruby-1.9.3-p0/bin/ruby extconf.rb
...
Package MagickCore was not found in the pkg-config search path.
Perhaps you should add the directory containing `MagickCore.pc'
then:

export PKG_CONFIG_PATH="/usr/local/lib/pkgconfig"

in my .bashrc file to pick up MagickCore.pc, then created two symlinks:

ln -s /usr/local/include/ImageMagick/wand /usr/local/include/ImageMagick-6/wand
ln -s /usr/local/include/ImageMagick/magick /usr/local/include/ImageMagick-6/magick

Now:

$ gem install rmagick
Building native extensions. This could take a while...
Successfully installed rmagick-2.13.2
1 gem installed
boom everything works fine.

For **Ubuntu** users:
It will never done directly on Ubuntu. You should first install packages to run this command...:

sudo apt-get install libmagickwand-dev

...and then do install:

gem install rmagick

You may get the same issue, for that, Try clearing your apt repository and removing any broken packages first:

sudo apt-get update
sudo apt-get autoclean
sudo apt-get clean
sudo apt-get autoremove

If the system identifies any broken packages, forcefully remove them (replace `package_name` with your own):

sudo dpkg --remove -force --force-remove-reinstreq package_name

Then re-install any missing packages again. :)

**Mac users using brew**

If you can use v6 of ImageMagick instead of 7, you can try this

brew install imagemagick@6 --force && brew link imagemagick@6 --force

Note this will unlink your existing IM installation, so be careful if you have other projects on your machine using ImageMagick without problems.

for a rails based application, I found this

sudo apt-get install -y libmagickwand-6-headers
C_INCLUDE_PATH=/usr/include/ImageMagick-6 gem install rmagick
bundle update rmagick
bundle install

worked on _debian_ **jessie**

An issue for me was that rmagick is out of date and not updated regularly. If you have too new of an ImageMagick version, then it might not be compatible. Check your version of ImageMagick using the following:

$ convert --version

If the ImageMagick version is > 7, it is not compatable with rmagick. The user will get errors such as

Can't install RMagick 2.16.0. Can't find MagickWand.h.
*** extconf.rb failed ***

Go back to version six of ImageMagick until they update rmagick to be compatible with version seven of ImageMagick. Someone has hosted the appropriate version(6) in a separate gem - 'imagemagick@6'.

If you need rmagick to work but currently have an imagemagick version 7 or higher, here are the steps to switch:

$ gem install imagemagick@6
$ brew unlink imagemagick
$ brew link imagemagick@6 --force

It looks like ImageMagick 7 changed include file path.

On building `rmagick`, since it includes file as `wand/MagickWand.h` There are no workarounds. It looks like sticking with ImageMagick 6 for now.

On Mac OS X (I tested on Sierra), I used HomeBrew's `versions` tap like:

brew tap homebrew/versions
brew install imagemagick@6

Then, use the path shown on above installation:

PKG_CONFIG_PATH=/usr/local/opt/imagemagick@6/lib/pkgconfig gem install rmagick

To install with ImageMagick 6.

At arch linux, after installing imagemagick@6, gem wasn't able to install package rmagick and got error below.

Can't install RMagick 2.16.0. Can't find MagickWand.h
Worked for me using below steps

1. added pkgconfig path to .bashrc

export PKG_CONFIG_PATH="/usr/lib/imagemagick6/pkgconfig"

2. Created two symlinks as below

ln -s /usr/include/ImageMagick-6/wand /usr/include/ImageMagick-6/wand

ln -s /usr/local/include/ImageMagick/magick /usr/include/ImageMagick-6/magick

If you're on Ubuntu, installing this package is what fixed it for me:

sudo apt-get install libmagickwand-dev

Got same error for alpine 3.9 image build. It comes with [ImageMagick 7.0.8.38-r0](